Liquid fuel burner for absorption refrigeration apparatus



G. GRUBB 2,153,282

LIQUID FUEL BURNER FOR ABSORPTION REFRIGERATION APPARATUS May 16, 1939.

Filed Aug. 25, 1936 2 Sheets-Sheet 1 INVENTOR. M

M4 ATTORNEY.

May 16, 1939.

G. GRUBB 2,158,282

LIQUID FUEL BURNER FOR ABSORPTION REFRIGERATION APPARATUS Filed Aug 25 1936 2 Sheets-Sheet 2 E E9. 4 Z; 07 /0.5'

V 6 a *i 29 m6 INVENTOR,

1; ATTORNEY.

Patented May 16, 1939 mourn rum. momma Fon. ABSORPTION REFRIGERATION APPARATUS Gnnnar Grubb, Stockholm, Sweden, asslgnor, by mesne assignments, to Serve], Inc., New York, N. Y.', a corporation of Delaware Appiioation August 25, 1936,, Serial No. 97,724

In G

13 Claims.

My invention relates to a system for supplying liquid fuel to burners. and to the use of such a system in a cabinet including a refrigerator and a stove unitj. v

It is an object of my invention to provide an improved system for supplying liquid fuel to burners in which liquid fuel is caused to flow by compressed air from a plurality of supply vessels to the burners connected thereto. Another object of my invention is to provide an improved system for supplying liquid fuel to burners in which compressed air is utilized to cause flow of fuel to the burners from a plurality of supply vessels which may be filled with liquid fuel at a single point.

A still further object of my invention is to provide a refrigerator and stove unit embodied in a single cabinet and operated by liquid fuel burners.

The novel features which I believe to be characteristic of my invention are set forth with particularity in the claims. The invention itself, however, both as to organization and method, together with further objects and advantages thereof, will be better understood by reference to the following description taken in conjunction with the accompanying drawings of which Fig. 1 is a front elevation, broken away and in section, of a refrigerator and a stove unit embodying myinvention; Fig. 2 is an enlarged view diagrammatically illustrating more clearly parts of the apparatus shown in Fig. 1; Fig. 3 is an.

enlarged sectional view of one of the burners shown in Fig. 2; Figs. 4 and 5 are fragmentary views in section and elevation, respectively, illustrating details of the apparatus shown in Figs. 1 and 2; Fig. 6 is an enlarged view of one of the burner valve controls shown in Figs. 1 and 2; Figs. '7, 8, and 9 are sectional views of the valves shown in Fig. 2 illustrating the three positions to which they may be adjusted; and Fig. 10 diagrammatically illustrates more fully refrigeration apparatus of which parts are shown in Figs. 1 and 2.

5 Referring to Fig. l, I have shown my improved system for supplying liquid fuel to burners in connection with a combination refrigerator and stove unit in which many of the parts of the system are common both to the refrigerator and stove burners. *The refrigerator and stove unit comprises a cabinet H! which may have a baked enamel or porcelain finish to provide a neat surface which is easily cleaned. Within the left hand part of the cabinet is provided a thermally .cooling element.

ermany September 17, 1935 ment is provided with openings into which fit grilles (not shown) for supporting cooking vessels on the top of the stove. The space between the storage compartment of the refrigerator and the stove serves as an apparatus compartment for housing parts of the stove and refrigeration apparatus.

I preferably employ refrigeration apparatus of a uniform pressure absorption type, generally as disclosed in Patent No. 1,609,334 to B. C. von Platen and C. G. Munters. Referring to Fig. 10, the. refrigeration apparatus includes a generator l4 containing a refrigerant in solution in an absorption liquid. Although I do not wish to be limited thereto, the refrigerant may be ammonia and the absorption liquid may be water. The generator I4 is heated by a liquid fuel burner [5 which projects a flame into the lower conicalshaped end l6 of a flue I! which extends vertically upward through the generator. A suitable liquid fuel is delivered from a supply vessel l8 through conduit I9 to the burner IS.

The heat applied to the generator l4 and its contents expels the ammonia out of solution, and the ammonia vapor flows upward to air-cooled rectifier 20 which condenses any water vapor accompanying the ammonia vapor. The water condensed in the rectifier drains back to the generator, and the ammonia vapor flows upward to an air-cooled condenser 2| provided with heat transfer fins 2|.

The ammonia is liquefied in the condenser 2| and flows through a conduit 22 to the upper end of an evaporator coil 23 which is arranged closely adjacent to a shell 24 and with the latter forms a cooling element. An inert gas, such as hydrogen, enters the upper end of the evaporator coil 23 from a vertically extending conduit 25. The hydrogen and liquid ammonia are in parallel flow or flowing in the same direction in the presence of each other, and the ammonia evaporates and diffuses into the hydrogen with consequent absorption of heat from the surroundings of the The resulting gas mixture of ammonia and hydrogen, that is, gas rich in ammonia, flows from the evaporator coil 23 through also be air-cooled in a manner similar to the condenser 2I.

The ammonia is absorbed out of the rich gas mixture into weak absorption liquid which enters the upper part of the absorber 29 through a vertically extending conduit II. The hydrogen, which is practically insoluble and weak in ammonia, passes upward from the absorber 29 through conduit '32, a plurality of parallel tubes 33 which form the inner passage of the gas heat exchanger 21, and conduit to the upper end of the evaporator coil 28. The gasheat exchanger 21 transfers heat from the weak gas flowing to the evaporator coil flowing to the absorber 29.

The absorption liquid flowing downward through the absorber 29 in counter-flow to the gas mixture becomes enriched in ammonia by absorption and flows through an inner conduit 34 of a liquid heat exchanger 35 to a coil 88 disposed about the lower end of the flue I1. The rich absorption liquid is raised by vapor-lift action from the coil 38 through conduit 8'! into the upper part of the generator I4. The absorption liquid is raised to a higher level inthe generator I4 than it is in the absorber 29, and absorption liquid weak in ammonia flows from the lower end of the generator through conduit 38, outer conduit 89 of the liquid heat exchanger 35, and conduit 3! into the upper end of the absorber 29.

Referring more particularly to Fig. 3, the burner I5 includes a hollow vertical conduit 48 to which is connected the conduit I9. To the conduit 48' is secured a shallow vessel H which is adapted to be filled with alcohol or suitable liquid to provide an auxiliary flame for starting the burner. To the upper end of conduit 48 is secured a pair of forked hollow arms 42 which are closed at their extreme ends. The arms 42 are'provided with openings 43 which are in alignment with openings in the lower part of an annular hollow shell 44 which is secured to the outer ends of the arms 42. At right angles to the arms 42 is arranged a U-shaped hollow tube 45 having its ends secured to the shell 44, the

tube 45 being provided with openings communicating with openings in the upper part of the hollow shell 44, as indicated at 48. A small nozzle 41 is provided at the lower part of the tube 45, and above the nozzle 41 is arranged an inverted cup 48 which is provided with a plurality of spaced openings 49 and secured to the inner wall of the annular shell 44.

When the burner I5 is being operated, the liquid fuel in the annular shell 44 is vaporized, and the vaporized fuel flows through the tube 45 and is projected upward in the form of a jet through the nozzle 41. The jet of vaporized fuel, which is mixed with surrounding air within the cup 48,. passes through the openings; 49 at" which region the burner flame is maintained. The openings 49 in the cup 48 are sufllciently close to the annular shell 44 so that the burner flame will contact the latter and insure vaporization of the liquid fuel in the annular shell 44.

The manner in which the parts of the refrigeration apparatus just described are arranged in the cabinet I8 is clearly shown in Fig. 1, with similar parts designated by the same reference 28 to the rich gas numerals. The generator I4 is positioned in the space between the storage compartment of the refrigerator and the stove and is adjacent the latter. The generator I4 is arranged within a metal shell 58 which contains a suitable heat insulating material, as indicated at 5|. The condenser 2| is arranged above the generator I4 and the absorber 29 (not shown) may be arranged to the rear of the generator I4. When an air-cooled absorber is employed it is preferable to arrange the absorber below the condenser 2|. At the rear of the cabinet I8 may be provided a plurality of openings to increase the amount of air circulating and passing over the condenser and absorber. The gas heat exchanger 2'! extends through an opening in a removable wall part 52 of the rear insulated wall of the storage compartment 58, as shown most clearly in Fig. 10, the removable wall part being provided to position the cooling element within the storage compartment 58.

The liquid fuel burners 54 and55, which are shown in Fig.2 and are similar to the liquid fuel burner .I5, are supported in any-suitable manner below thegrilles mounted on the top of the stove. A larger burner 58, which is diagrammattically illustrated as comprising two single burners connected in parallel, is supported within the cabinet I8 to heat the oven compartment of the stove The cabinet I8 may be provided with an opening 51 adapted to be closed by a small door whereby access may be had to the oven burner 58 for igniting and cleaning the same. A similar opening and small door (not shown) may be provided at the front of the cabinet adjacent the generator burner I5 whereby access may be had to the generator burner. Liquid fuel is delivered from separate supply vessels 58, 59, 80 through-conduits =8I, 82, 89 to the stove burners 54, 55, 58.

In the present embodiment the generator burner I5 is ata higher level than the supply vessel I 8, and compressed air is utilized to cause liquid fuel to flow to the burner I5 by maintaining the liquid fuel under pressure in the supply vessel I8. Inasmuch as it is contemplated that one of the conditions effecting the operation of the refrigerator is that of maintaining the liquid fuel in the supply vessel I8 under pressure by compressed air, I make use of this condition to facilitate the operation of the stove burners 54, 55, 58. For this reason each of the stove burners'54, 55, 58 is arranged above the liquid level of fuel in its associated supply vessel, and the supply vessels of all the burners are so arranged that they may be simultaneously filled with'liquid fuel at a single point and also simultaneously ferring to Fig. 1, this may be accomplished by arranging the liquid fuel supply vessels I8, 58, 59, 88 one above the other in the apparatus space between the generator I4 and the storage compartment of the refrigerator. Above the uppermost supply vessel 58 is located a storage vessel 84 for compressed air which is connected by conduit 85 to an air pump 88 arranged at the bottom and forward part of the cabinet III. The conduit 85 is connected to the cylinder 81 of the air pump within which is arranged a piston 88 to which is connected piston rod 89. The rod 89 extends through an opening in a bracket 18 to which the air pump is secured, and the outer end of the rod is pivotally connected to the lower end of a lever II which is pivotally connected at its upper end to a foot operated pedal I2. The pedal I2, which is located at the front of the cabinet I9 adjacent to the door II of the refrigerator storage compartment, is hinged at its lower end to the forward projecting part of the bracket 19.

When the pedal I2 is pressed downward the rod 69 and piston 68 are moved rearwardly against tension of spring I3 within the cylinder 61, the air in the storage vessel 64 is compressed. When the pedal I2 is released, spring I9 causes the rod 69 to move forward whereby valve 68a at the inside of the piston 68 opens to admit air into the cylinder 61 which is compressed with the subsequent downward movement of the pedal 12. A check valve 14 is provided adjacent the air pump 66 to prevent air from flowing from the conduit 65 to the cylinder 61.

The storage vessel 64 is connected by conduits I5, 16, 11, I8 to the upper parts of the supply vessels I8, 58, 59, 69, and in these conduits are connected control valves I9, 89, 8|, 92 which are preferably located at the rear of the front wall of the cabinet I9 with the control handles, accessible from the front of the cabinet, as shown in Fig. 1. Referring to Figs. 6 to 9 inclusive, each of the control valves may be adjusted to one of three positions. The control valve I9 shown in Fig. 6, for example, includes a casing 83 having an opening 84 and openings to which the two parts 15a and 15b of conduit I5 are connected. Within the casing 13 is arranged a valve member 85 having two curved passages 86 and 81, respectively. When the handle 88 is at position I indicated in Fig. 6, the valve member 85 is in the position shown in Fig. '7 with the passage 86 communicating with the conduits 15a and 15b whereby the storage vessel 64 is connected to the supply vessel I8 and the fuel in the latter is maintained under pressure. When the handle 98 is at position 8 indicated in Fig. 6, the valve member 85 is in the position shown in Fig. 8 with the passages 86 and 81 out of communication with the conduits 15a and 15b and the opening 84, whereby the storage vessel 64 and supply vessel I8 are disconnected from each other. With the handle 88 in position 9 indicated in Fig. 6, the valve member 85 is in the position shown in Fig. 9 with the storage vessel 64 and supply vessel I8 disconnected and the passage 81 communicating with the conduit 15b and opening 94, whereby the compressed air in the supply vessel is released to the atmosphere.

In the conduit I5 is also provided a control valve 99 which is arranged to control the supply of compressed air from the vessel 64 to the supply vessel I8 of the generator burner I5 in response to a temperature condition affected by the cooling element of the refrigerator. The control valve 89 includes a casing 99 within which is disposed a valve member 9|. The valve member 9| is connected by a rod 92 to an expansible bellows 93 which is connected by a tube 94 to a thermal element 95 arranged in thermal contact with the cooling element. The bellows 93, tube 94, and thermal element 95 constitute an expansible fluid thermostat containing a volatile fluid which increases and decreases in volume with corresponding changes in temperature. When the cooling element tends to rise above a desired low temperature, the increase in volume of the volatile fluid causes the bellows 93 to expand and move thevalve member downward to the position shown in Fig. 2. In this position the passage 96 in valve member 9| communicates with the two parts of the conduit 15 connected .to the casing 99, and liquid fuel in the supply vessel 'IB is maintained under pressure whereby fuel is caused to flow to the burner I5.

When the cooling element tends to fall below the desired low temperature, the expansible fluid becomes reduced in volume and causes the bellows 99 to contract and move the valve member 9| upward. With such upward movement of the valve 9|, the conduit 15 is blocked to disconnect the storage vessel 64 from the supply vessel I8; and, as the passage 96 in the valve member 9| moves adjacent to the opening 99a of the casing 99, the supply vessel I8 is opened to the atmosphere and the compressed air therein is gradually released so that fuel is no longer pumped to the burner I5.

The control valve 89 and expansible fluid thermostat preferably are so arranged that, when the cooling element is substantially at the desired temperature, the valve 9| assumes such a position that the horizontal portion of the passage 96 is between the upper connection of the casing 99 to the conduit I5 and the opening 99a, whereby the vessel 64 is blocked off without completely reducing the pressure in the supply vessel I8. With the storage vessel 64 blocked off, the pressure in the supply vessel I8 gradually becomes smaller as liquid fuel is being pumped to the burner I5 with the result that the burner flame becomes reduced in size. The reduction in size of the burner flame decreases the amount of refrigeration produced by the coil 23 of the cooling element and avoids completely shutting off the supply of liquid fuel to the burner I5. Only when the temperature of the cooling element tends to fall below the desired temperature is the valve 9| moved upward such a distance that the passage 96 therein communicates with the opening 99a, whereby the compressed air in the supply vessel I8 is released and the pumping of liquid fuel to the burner I5 is stopped.

To the upper parts of the supply vessel: I8, 58, 59, 69 are connected horizontal conduits 91, 98, 99, I99 which are arranged within the cabinet I9 behind the rear wall of the thermally insulated storage compartment and extend through openings in the end wall of the cabinet. The outer ends of the conduits 91, 98, 99, I99 are connected to a vertically disposed pipe or tubular member I9I which is closed at its lower end and within which telescopically fits a tube or sleeve I92. In Fig. 2 the conduits 91, 98, 99, I99 are shown very short, whereas in Fig. 1 the true lengths of the conduits are indicated in dotted lines with the pipe I9I enclosed in a casing I93 secured to the end wall of the cabinet I9. The tube I92 is provided with a plurality of aligned openings I94 which are adjacent to the points where the conduits are connected to the pipe I9I so that, when the tube I92 is turned in a counter-clockwise direction from the position shown in Fig. 2, all of the conduits will communicate with the tube I92. At the upper end of the tube I92 the wall thereof is recessed to receive a downward extending projection I formed on the inside of a filling cap I96, as shown in Fig. 4, a gasket I91 being provided to insure an airtight connection when the cap |96 is locked in its closed position. The cap |96 is provided with an inverted L-shaped slot which cooperates with a pin I98 fixed to the upper end of the pipe I9I to form a bayonet-type lock for the cap I96. When the cap I96 is in the locked position shown in Fig. 5, the tube I02 is in the position shown In Fig. 4 with the openings I 04 out of communication with the conduits connected to the pipe IIII. When it is desired to fill the supply vessels I8, 58, 59, 60 with liquid fuel the cap I06 is turned 90 in a counter-clockwise direction whereby the vertical portion of the slot is adjacent to the pin I08 and the cap I06 is removable from the pipe I02, In turning the cap I06 the projection I85 thereon causes the tube I02 to turn so that the openings I04 are in communication-with the conduits 91, 98, 99, I00. When the supply vessels are filled with liquid fuel through the tube I02, the bottom vessel I8 is filled first and thereafter the vessels 60, 59, and 58 are filled in the order mentioned.

In order to prevent liquid fuel in the supply vessels from discharging through the tube I02 when the cap I08'is removed, a. device is provided at the cap I08 so that compressed air from the storage vessel 64 is discharged to the atmosphere before the cap is removed. This device comprises a valve including a casing I09 having an opening H and a second opening connected to a conduit III which extends within the cabinet and is connected to the storage vessel 64. The valve casing I09 is mounted on the end wall of the cabinet I0, as shown in Fig. 1, while in Fig. 2 the conduit III is diagrammatically shown very short with the casing I09 connected thereto. Within the casing I09 is arranged a valve member II2 having a control handle II3 which is normally adapted to rest on top of the filling cap I 06. When it is desired to fill the supply vessels with liquid fuel, therefore, it is necessary to raise the handle II 3 whereby the valve member H2 is turned so that the passage II4 therein communicates with conduit III and the opening I I 0 to release compressed air from the storage vessel 64 to the atmosphere. After the handle II3 has been raised, the control valves I9, 80, 8I, 82 are either moved to the position shown in Fig. 7 or Fig, 9, whereby the compressed air in the fuel supply vessels is also discharged to the atmosphere.

The operation of the apparatus just described is substantially as follows: It is assumed that the supply vessels I8, 58, 59, 60 have been filled with a liquid fuel, such as kerosene, for example; that the control valves I9, 80, 8|, 82 are in the position shown in Fig. 8; and that the pedal I2 has been operated to provide: compressed air in the storage vessel 84. The refrigeration apparatus is now started by opening the small door at the front of the cabinet adjacent to the burner I5 and-filling the shallow vessel 4| with a fluid, such as alcohol. The alcohol is ignited to provide an auxiliary flame for heating the annular shell 44 of the burner and, after an interval of time, the handle 88 of the control valve I9 is gradually moved toward the position indicated by reference numeral 1 in Fig. 6. The valve is now in the position shown in Fig. 7 and liquid fuel from the supply vessel I8 is caused to flow to the annular shell 44 of the burner. Due to the heating of the shell 44 by the auxiliary flame, the liquid fuel is vaporized to provide the burner flame at the openings 49 of the cup 48, as described above. After the burner I5 has been started, the burner flame effectively heats the annular shell to insure vaporization of the liquid fuel.

Duringnormal operation of the refrigerator the burner I5 is constantly heating the generator I4 with the thermal bulb 95 of the expansible fluid thermostat being operative to regulate valve 89 amazes in response to a temperature condition affected by the cooling element, as described above, to control the flow of liquid fuel to the burner I5 so that the cooling element is maintained substantially constant at a desired low temperature. Since the apparatus provided for filling the liquid fuel supply vessels is so constructed and arranged that the supply vessels are not in communicationwith each other when the fillingcap I06 is locked in its closed position and the openings I04 in tube I02 are not in communication with the conduits 91, 98, 99 and I00, the pressure under which the liquid fuel in the different supply vessels is maintained may be controlled independently. When it is desired to use the plate burners 54 and 55 on top of the stove, for example, the shallow vessels associated therewith are filled with a suitable fluid, such as' alcohol, and then ignited. After the annular shells of the burners have been heated for an interval of time by the auxiliary flames, the control valves 80 and 8| are gradually moved to the position shown in Fig. 7 whereby liquid fuel is caused to flow from the supply vessels 58 and 59 to theburners 54 and 55. If the pressure in the vessels 58 and 59 is too high, the control valves 80 and 8| are moved to the position shown in Fig. 9 to release compressed air from the supply vessels and reduce the pressure under which the liquid fuel is maintained. When the desired pressure is obtained, the valves 90 and 8I are moved to the position shown in Fig, 8 so that the fuel supply vessels are disconnected from the compressed air storage vessel 64 and the fuel in the supply vessels is at the desired pressure. When it is again necesary to increase the size of the burner flame, the control valves are again moved tothe position shown in Fig. 7 whereby the storage vessel 64 is connected to the supply vessels. In view of the foregoing, it will be understood that each of the burners I5, 54, 55 and 56 may beindependently controlled while at the same time the apparatus is so constructed and arranged that many of the parts are common both to the refrigerator and to the stove.

In view of the fact that the liquid fuel is consumed at a relatively small rate at the burners I5, 54, 55, 58, diihculty is not encountered in maintaining the air under sufiicient pressure in the storage vessel 64 by means of the foot operated pedal I2. Instead of employing the foot operated pedal I2 to maintain the liquid fuel under pressure in the supply vessels, an automatically operable air pump may be provided. By employing compressed air to effect the normal continuous operation of the refrigerator and utilizing such compressed air to operate additional liquid fuel burners only a part of the time, a very compact arrangement of the stove and refrigerator parts is effected. Also, a dependable control of each stove burner is obtained without affecting the operation of the refrigerator burner or other stove burners.

While I have shown and described a particular embodiment of my invention, such variations and modifications are contemplated as fall within the true spirit and scope of my invention, as

burners, and means including a compressed air storage vessel connected to said supply vessels to provide compressed air in the latter for causing fuel to flow therefrom to said burners, structure connected to said supply vessels having a single opening for filling said supply vessels with liquid fuel, a removable member for closing said opening, and a device cooperating with said structure whereby compressed air in said storage vessel is discharged to the atmosphere before said member may be removed to fill said supply vessels with liquid fuel.

2. In combination, apparatus including a part adapted to be heated, a liquid fuel burner for heating said part, a second liquid fuel burner, supply vessels adapted to contain liquid fuel, means including conduits for conducting fuel from each of said supply vessels to one of said burners, and means including a compressed air storage vessel connected to said supply vessels to provide compressed air in the latter to cause fuel to fl w therefrom to said burners, structure connecte to said supply vessels having a single opening for filling said supply vessels with liquid fuel, and a removable member for closing said opening, said structure and said member being so constructed and arranged that when said member is positioned to close the opening said supply vessels are out of communication with each other.

3. In combination, apparatus including a part adapted to be heated, a liquid fuel burner for heating said part, a second liquid fuel burner, supply vessels adapted to contain liquid fuel, means including conduits for conducting fuel from each of said vessels to one of said burners, structure including a compressed air storage vessel and conduits connecting the latter and each of said supply vessels to provide compressed air in said supply vessels for causing fuel to fiow therefrom to said burners, and a control valve connected in each of said last-mentioned conduits for independently controlling the flow of fuel from each of said supply vessels to one of said burners, each of said control valves being constructed and arranged to maintain said storage vessel in communication with one of said supply vessels, to disconnect said storage vessel from one of said supply vessels, and to permit compressed air to discharge from one of said supply vessels to the atmosphere.

4. In combination, a cabinet having a thermally insulated storage compartment and an oven compartment, absorption refrigeration apparatus mounted in said cabinet and including a cooling element arranged within said storage compartment and a generator, at least one liquid fuel burner serving as a heating element at the top of said cabinet, liquid fuel burners for heating said generator and said oven compartment, vessels in said cabinet adapted to contain liquid fuel, conduits for conducting liquid from each of said vessels to one of said burners, said vessels being stacked one above another and one or more of said burners being located below the top of said stack of vessels, a compressed air storage vessel in said cabinet, separate conduits connecting said storage vessel to each of said liquid fuel vessels, and means to provide compressed air in said storage vessel.

5. The combination defined in claim 4 and including valves in said conduits connecting said storage vessel and said supply vessels to control the compressed air in the latter, and means exterior of said cabinet for controlling said valves.

6. The combination defined in claim 4 and including a valve in said conduit connecting said storage vessel and said supply vessel arranged to supply liquid fuel to said generator burner, said valve controlling the compressed air in said supply vessel, and means responsive to a temperature condition affected by said cooling element for controlling said valve.

7. The combination defined in claim 4 in which said means to provide compressed air in said storage vessel includes a pump, and manually operated means to operate said pump.

8. The combination defined in claim 4 in which said means to provide compressed air in said storage vessel includes a pump, and a foot operated pedal at the front of said cabinet to operate said pump.

9. The combination defined in claim 4 and including structure connected to said supply vessels and providing a single point for filling said supply vessels with liquid fuel.

10. In combination, a plurality of liquid fuel burners, vessels adapted to contain liquid fuel, conduits for conducting liquid from each of said vessels to one of said burners, means to provide compressed air in said vessels to cause liquid to flow from the latter to said burners, and structure connected to said vessels and having a single opening for filling said vessels with liquid fuel, said structure having a single operating handle and being so constructed and arranged that said vessels may be closed and out of communication with each other. 5 I

11. The combination defined in claim and including means cooperating with said structure whereby compressed air is released from said vessels before said structure is rendered operative to permit insertion of liquid fuel at the single opening.

12. The combination of a plurality of liquid fuel burners, a liquid fuel reservoir for each of said burners, each burner being located above its corresponding reservoir, a compressed air storage vessel connected to said reservoirs to provide compressed air in the latter for causing fuel to fiow therefrom to said burners, said reservoirs being stacked one above another in a cabinet structure and said burners being located at different levels in said cabinet structure, one of said burners being located above said stack of reservoirs and another of said burners being located below the top of said stack of reservoirs, said first burner being connected to an upper reservoir and said second burner being connected to a lower reservoir.

13. A combination refrigerator and stove including a cabinet having a thermally insulated storage compartment, an oven compartment, and a space intermediate said compartments, heat operated refrigeration apparatus including a cooling element in said storage compartment, a liquid fuel burner for said refrigeration apparatus, a liquid fuel burner for said oven compartment, a liquid fuel burner serving as a heating element in the upper part of said,cabinet, a plurality of liquid fuel reservoirs stacked one above another in said central space, each of said reservoirs being connected to a different one of said burners and each burner being located above its respective reservoir, a compressed air storage tank connected to said reservoirs for raising liquid fuel to said burners, striicture having a single opening for filling said reservoirs, and one or more of said burners being located below the top of said stack of reservoirs.

GUNNAR GRUBB. 

